> [!SnapbuildRead] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_snapbuildread.png"></td><td><b>Wait Category</b></td><td>IO</td></tr><tr><td><b>Mechanism</b></td><td><code>Snapbuild</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Distributed/Redistribute">Redistribute</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/disk IO">disk IO</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Decoding Context Retrieval stall</b>. To correctly interpret WAL records into logical changes, the engine must know exactly what the system catalogs (the "blueprint") looked like when those records were written.</td></tr></table>